Asked by Shakira

A friend opens a savings account by depositing $1000. He deposits an additional $75 into the account each month.
a. What is a rule that represents the amount of money in the account as an arithmetic sequence?
b. How much money is in the account after 18 months? Show your work.
Answered by bobpursley
a. this is a arithmetic series, not a sequence. the Sum of the series is given by months m is


sum=m/2 * (2*1000 + (m-1)75)

for 18 months, put m=18 and compute.
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